I took out Los Murtos and Volk. Have at least 4 stars in all stats. Even maxed out strength and explosives. Get the Firefly, it's the tracking grenade launcher, to speed up your explosives. You're gonna have to max out your driving skill if you intend to complete all the driving challenges. You have to have the SUV's jump ability to reach some of the stunt circles. This game is AWSOME!!!

Heh, dedication. Like I said earlier get the grenadier or the firefly, Volk have the grenadier and the Shai-Gen have the firefly. Kill enough thugs to have hit squads sent out on you, then wait for 2 or 3 carloads of them to pull up around you(best if you're up on a building and blast the central most car with a grenade or launcher. 4 star explosives are pretty killer, literally.

I have beaten the game, I have 20 more agility orbs to go, I have maxed out all 5 things to 4 stars and 99 which goes into 4 stars and --

I have about 700/900 pts so far, just finishing up some races and junk. By the way my progress is the first day I beat it, 2nd day I leveled all my skills to 4 and now i'm just earning achievements and getting agility orbs.